1155010121 has 4 divisors (see below), whose sum is σ = 1192268544. Its totient is φ = 1117751700.

The previous prime is 1155010117. The next prime is 1155010123. The reversal of 1155010121 is 1210105511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1210105511 = 3761 ⋅321751.

It is a cyclic number.

It is not a de Polignac number, because 1155010121 - 2² = 1155010117 is a prime.

It is a super-2 number, since 2×1155010121² = 2668096759224869282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1155010121.

It is not an unprimeable number, because it can be changed into a prime (1155010123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18629165 + ... + 18629226.

It is an arithmetic number, because the mean of its divisors is an integer number (298067136).

Almost surely, 2^1155010121 is an apocalyptic number.

It is an amenable number.

1155010121 is a deficient number, since it is larger than the sum of its proper divisors (37258423).

1155010121 is an equidigital number, since it uses as much as digits as its factorization.

1155010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37258422.

The product of its (nonzero) digits is 50, while the sum is 17.

The square root of 1155010121 is about 33985.4398382601. The cubic root of 1155010121 is about 1049.2088132031.

Adding to 1155010121 its reverse (1210105511), we get a palindrome (2365115632).

The spelling of 1155010121 in words is "one billion, one hundred fifty-five million, ten thousand, one hundred twenty-one".